winhttp/tests: Fix potential crash on BSD

[André Hentschel]

See e.g. http://test.winehq.org/data/a3b8065600ec43349a65a707e45bf4c8ed111360/bsd_fg-freebsd81-vm/winhttp:winhttp.html
---
 dlls/winhttp/tests/winhttp.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)


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